Scott I would NOT mix the two. There's no way of ensuring a totally equal mixture. If you work up a load with one powder, there's no reason you shouldn't be able to work up another load with maybe 5 test samples of 10 rounds each of the second powder to get you in the ballpark of where you need to be, then fine-tune the load from there. That's not bad with an 8 pound jug of powder. You're not going to have to start from scratch again.
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